/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors 
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.merge.orgunit.handler;

import java.util.Collection;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import lombok.RequiredArgsConstructor;
import org.hisp.dhis.category.CategoryOption;
import org.hisp.dhis.common.UID;
import org.hisp.dhis.configuration.Configuration;
import org.hisp.dhis.configuration.ConfigurationService;
import org.hisp.dhis.dataset.DataSet;
import org.hisp.dhis.merge.orgunit.OrgUnitMergeRequest;
import org.hisp.dhis.organisationunit.OrganisationUnit;
import org.hisp.dhis.organisationunit.OrganisationUnitGroup;
import org.hisp.dhis.program.Program;
import org.hisp.dhis.user.User;
import org.hisp.dhis.user.UserOrgUnitProperty;
import org.hisp.dhis.user.UserService;
import org.springframework.stereotype.Component;

/**
 * Merge handler for metadata entities.
 *
 * @author Lars Helge Overland
 */
@Component
@RequiredArgsConstructor
public class MetadataOrgUnitMergeHandler {
  private final UserService userService;

  private final ConfigurationService configService;

  public void mergeDataSets(OrgUnitMergeRequest request) {
    Set<DataSet> dataSets =
        request.getSources().stream()
            .map(OrganisationUnit::getDataSets)
            .flatMap(Collection::stream)
            .collect(Collectors.toSet());

    dataSets.forEach(
        ds -> {
          ds.addOrganisationUnit(request.getTarget());
          ds.removeOrganisationUnits(request.getSources());
        });
  }

  public void mergePrograms(OrgUnitMergeRequest request) {
    Set<Program> programs =
        request.getSources().stream()
            .map(OrganisationUnit::getPrograms)
            .flatMap(Collection::stream)
            .collect(Collectors.toSet());

    programs.forEach(
        p -> {
          p.addOrganisationUnit(request.getTarget());
          p.removeOrganisationUnits(request.getSources());
        });
  }

  public void mergeOrgUnitGroups(OrgUnitMergeRequest request) {
    Set<OrganisationUnitGroup> groups =
        request.getSources().stream()
            .map(OrganisationUnit::getGroups)
            .flatMap(Collection::stream)
            .collect(Collectors.toSet());

    groups.forEach(
        oug -> {
          oug.addOrganisationUnit(request.getTarget());
          oug.removeOrganisationUnits(request.getSources());
        });
  }

  public void mergeCategoryOptions(OrgUnitMergeRequest request) {
    Set<CategoryOption> categoryOptions =
        request.getSources().stream()
            .map(OrganisationUnit::getCategoryOptions)
            .flatMap(Collection::stream)
            .collect(Collectors.toSet());

    categoryOptions.forEach(
        co -> {
          co.addOrganisationUnit(request.getTarget());
          co.removeOrganisationUnits(request.getSources());
        });
  }

  public void mergeOrganisationUnits(OrgUnitMergeRequest request) {
    Set<OrganisationUnit> children =
        request.getSources().stream()
            .map(OrganisationUnit::getChildren)
            .flatMap(Collection::stream)
            .collect(Collectors.toSet());

    children.forEach(c -> c.updateParent(request.getTarget()));
  }

  public void mergeUsers(OrgUnitMergeRequest request) {
    List<User> dataCaptureUsers =
        userService.getUsersWithOrgUnits(
            UserOrgUnitProperty.ORG_UNITS, UID.of(request.getSources().stream()));

    dataCaptureUsers.forEach(
        u -> {
          u.addOrganisationUnit(request.getTarget());
          u.removeOrganisationUnits(request.getSources());
        });

    List<User> dataViewUsers =
        userService.getUsersWithOrgUnits(
            UserOrgUnitProperty.DATA_VIEW_ORG_UNITS, UID.of(request.getSources().stream()));

    dataViewUsers.forEach(
        u -> {
          u.getDataViewOrganisationUnits().add(request.getTarget());
          u.getDataViewOrganisationUnits().removeAll(request.getSources());
        });

    List<User> teiSearchOrgUnits =
        userService.getUsersWithOrgUnits(
            UserOrgUnitProperty.TEI_SEARCH_ORG_UNITS, UID.of(request.getSources().stream()));

    teiSearchOrgUnits.forEach(
        u -> {
          u.getTeiSearchOrganisationUnits().add(request.getTarget());
          u.getTeiSearchOrganisationUnits().removeAll(request.getSources());
        });
  }

  public void mergeConfiguration(OrgUnitMergeRequest request) {
    Configuration config = configService.getConfiguration();
    OrganisationUnit selfRegistrationOrgUnit = config.getSelfRegistrationOrgUnit();

    if (selfRegistrationOrgUnit != null && request.getSources().contains(selfRegistrationOrgUnit)) {
      config.setSelfRegistrationOrgUnit(request.getTarget());
      configService.setConfiguration(config);
    }
  }
}
